I would like to know if the air-handler ARUF 193116 CA, should be used in conjunction with a an outdoor thermostat. If so is there a model one would recommend. My mechanical contractor says its not worth it to put such thermostats on goodman equipment, however I would like to; but he's resisting and the supply house told me that they would only speak to the mechanical engineer. So before I fire him, i'd like to provide him with a model thermostat to install.
Side note: the manual has a wiring diagram that includes an outdoor thermostat for the AT/AR unit, and my units do have the optional blue (medium speed) wire.